1.   The leaders also agreed to strengthen and coordinate efforts to protect oceans and freshwater supply.

2.   Changes in water temperature can erode coral reefs, and rising seas threaten freshwater supplies.

3.   The disappearance of wetlands also can have an adverse affect on world freshwater supplies, Gleick said.

4.   They also play a vital role in the water-cycle by contributing to atmospheric moisture that falls back on land to replenish our freshwater supply.

5.   Water managers also can use the data to understand how seawater intrudes into underground freshwater supplies and trace pollutants.